Package org.hibernate.proxy.pojo

Source Code of org.hibernate.proxy.pojo.BasicLazyInitializer

/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2010, Red Hat Inc. or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors.  All third-party contributions are
* distributed under license by Red Hat Inc.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA  02110-1301  USA
*/
package org.hibernate.proxy.pojo;

import java.io.Serializable;
import java.lang.reflect.Method;

import org.hibernate.engine.spi.EntityKey;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.internal.util.MarkerObject;
import org.hibernate.proxy.AbstractLazyInitializer;
import org.hibernate.type.CompositeType;

/**
* Lazy initializer for POJOs
*
* @author Gavin King
*/
public abstract class BasicLazyInitializer extends AbstractLazyInitializer {

  protected static final Object INVOKE_IMPLEMENTATION = new MarkerObject("INVOKE_IMPLEMENTATION");

  protected final Class persistentClass;
  protected final Method getIdentifierMethod;
  protected final Method setIdentifierMethod;
  protected final boolean overridesEquals;
  protected final CompositeType componentIdType;

  private Object replacement;

  protected BasicLazyInitializer(
      String entityName,
          Class persistentClass,
          Serializable id,
          Method getIdentifierMethod,
          Method setIdentifierMethod,
          CompositeType componentIdType,
          SessionImplementor session,
          boolean overridesEquals) {
    super(entityName, id, session);
    this.persistentClass = persistentClass;
    this.getIdentifierMethod = getIdentifierMethod;
    this.setIdentifierMethod = setIdentifierMethod;
    this.componentIdType = componentIdType;
    this.overridesEquals = overridesEquals;
  }

  protected abstract Object serializableProxy();

  protected final Object invoke(Method method, Object[] args, Object proxy) throws Throwable {
    String methodName = method.getName();
    int params = args.length;

    if ( params==0 ) {
      if ( "writeReplace".equals(methodName) ) {
        return getReplacement();
      }
      else if ( !overridesEquals && "hashCode".equals(methodName) ) {
        return System.identityHashCode(proxy);
      }
      else if ( isUninitialized() && method.equals(getIdentifierMethod) ) {
        return getIdentifier();
      }
      else if ( "getHibernateLazyInitializer".equals(methodName) ) {
        return this;
      }
    }
    else if ( params==1 ) {
      if ( !overridesEquals && "equals".equals(methodName) ) {
        return args[0]==proxy;
      }
      else if ( method.equals(setIdentifierMethod) ) {
        initialize();
        setIdentifier( (Serializable) args[0] );
        return INVOKE_IMPLEMENTATION;
      }
    }

    //if it is a property of an embedded component, invoke on the "identifier"
    if ( componentIdType!=null && componentIdType.isMethodOf(method) ) {
      return method.invoke( getIdentifier(), args );
    }

    // otherwise:
    return INVOKE_IMPLEMENTATION;

  }

  private Object getReplacement() {
    final SessionImplementor session = getSession();
    if ( isUninitialized() && session != null && session.isOpen()) {
      final EntityKey key = session.generateEntityKey(
          getIdentifier(),
          session.getFactory().getEntityPersister( getEntityName() )
      );
      final Object entity = session.getPersistenceContext().getEntity(key);
      if (entity!=null) setImplementation( entity );
    }

    if ( isUninitialized() ) {
      if (replacement==null) {
        replacement = serializableProxy();
      }
      return replacement;
    }
    else {
      return getTarget();
    }

  }

  public final Class getPersistentClass() {
    return persistentClass;
  }

}
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